#!/bin/sh
#
# Copyright (C) 2008 Chris Wilson
# Copyright (C) 2006 Holger Levsen
#
# This program is free software; you can redistribute it and/or
# modify it under the terms of the GNU General Public License
# as published by the Free Software Foundation; version 2 dated June,
# 1991.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
#
# Configuration variables
#   vservers - specify the vservers to include in the graph (default: all)
#   limits - if true, turn on limit graphing (default: false)
#
# NOTE: If no configuration variables are set, the defaults will be used

# Example /etc/munin/plugin-conf.d/munin-node
#
# The first group monitors the vservers named "vserver1 vserver2
# vserver3 vserver4" and looks to see if the resource limit has been
# breached, if so it sends a message to nagios via send_nsca, and
# sends an email to notify that this has happened.
#
# The second monitors the vservers "vserver5 vserver6 vserver7" and
# has no limit notifications turned on.
#
# The third monitors all vservers on the system, in one graph, and it has
# no limit notifications defined.
#
# You can use any combination of these to fit your needs.
#
#
# [vsrmem_group1]
# user root
# env.vservers vserver1 vserver2 vserver3 vserver4
# env.limits 1
# contacts nagios email
# contact.nagios.command /usr/bin/send_nsca -H your.nagios-host.here -c /etc/send_nsca.cfg
# contact.email.command mail -s "Munin-notification for ${var:group} :: ${var:host}" your@email.address.here
#
# [vsrmem_group2]
# user root
# env.vservers vserver5 vserver6 vserver7
# env.limits 0
#
# [vserver_rmemory]
# user root
#
# Graph Vserver RSS usage and limits
#
# Changelog
# version 0.1 - 2006 April xx - Holger Levsen
#  - initial author
# version 0.2 - 2006 April 24 - Micah Anderson <micah@riseup.net>
#  - Add dynamic arch page size determination
#  - Some cleanup and clarification
# version 0.3 - 2006 May 3 - Micah Anderson <micah@riseup.net>
#  - Add ability to group vservers via environment vars
#  - Fix missing close quotes and standardize indents
#  - Add limit notification
#  - Update documentation to include info on groups and limits
# version 0.4 - 2006 Jun 22 - Micah Anderson <micah@riseup.net>
#  - Fix error that results if NodeName is set to include a domain name
# version 0.5 - 2008 Apr 12 - Chris Wilson <chris+munin@qwirx.com>
#  - Changed to display limit hits instead of resource usage
#  - Adapt to latest vserver kernel (lack of some variables in /proc/virtual)
#    Note that your vserver names may change if the contents of
#    /etc/vservers/* do not match the nodenames. Also you must specify
#    the vservers variable with context IDs (XIDs) rather than names.

scriptname=`basename $0`
resource=`echo $scriptname | sed -e 's/.*_//'`
vservers="$vservers"

if [ -z "$vservers" ]; then
	vservers=`ls -1 /proc/virtual | grep -v info | grep -v status`
fi

if [ "$1" = "config" ]; then
	echo "graph_title Vserver $resource limit hits"
	# echo 'graph_args --base 1024k -l 0'
	echo "graph_vlabel $resource limit hits"
	echo 'graph_category virtualization'
	echo "graph_info Shows number of hits on $resource limits by each vserver.'"

	for vserver_xid in $vservers ; do
		longname=`/usr/sbin/vuname --xid $vserver_xid NODENAME | cut -f2`
		name=`echo $longname | cut -d. -f1`
		echo "$vserver_xid.label $name"
		echo "$vserver_xid.info $resource limit hits by $longname"
		echo "$vserver_xid.critical 1"
		echo "$vserver_xid.min 0"
		echo "$vserver_xid.type DERIVE"
	done

	exit 0
elif [ "$1" = "suggest" ]; then
	if [ -z "$vservers" ]; then
		echo "No vservers running, cannot suggest!" >&2
		exit 2
	fi
	vserver1=`echo $vservers | sed -e 's/ .*//'`
	tail -n +2 /proc/virtual/$vserver1/limit | sed -e 's/:.*//'
else
	for vserver_xid in $vservers; do
		cat /proc/virtual/$vserver_xid/limit \
		| awk -v xid="$vserver_xid" -v res="$resource:" \
			'{ if ( $1 == res )
			printf "%s.value %d\n", xid, $7 }'
	done
fi